oops, my v2 boards need a hack
We did some experimenting and determined that in fact the different voltages/resistances did effect the charging rates!
Using the 2.8V & 2.0V setup resulted in a 1 Amp charge rate and the 2.0V & 2.0V setup resulted in a 500mA charge rate.
capacitor 220uF/6.3V+, 2x
capacitor 0.1uF, 2x
1/8W 5% 3.3K resistor
1/8W 1% 75K resistor, 2x
1/8W 1% 49.9K resistor, 2x
1N5818 (or 1N5817, etc) Schottky Diode
10uH power inductor, at least 1A current capability